draining?hardly. a lot of energy can come from having really good sex, relationship or not. it's not like it's an effort to maintain a fuck buddy kind of thing, not at all. the effort comes in fending off everybody who feels the need to rant on and on that it's 'impossible' for a chick to have a great sex life without emotional hangups.
all in all though, it's a lot less draining to have a fuck buddy than it is to have a relationship. dealing with just sex is easy. dealing with sex *and* all the emotional load is work.
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kuru
'dancing is the vertical expression of horizontal desire.'
-robert frost